Smartphone battery



FIG. 1 is a perspective view of a smartphone battery;

FIG. 2 is a front view of a smartphone battery;

FIG. 3 is a back view of a smartphone battery;

FIG. 4 is a top view of a smartphone battery;

FIG. 5 is a bottom view of a smartphone battery;

FIG. 6 is a side view of a smartphone battery; and,

FIG. 7 is another side view of a smartphone battery.

The broken lines illustrate portions of the smartphone battery which form no part of the claimed design. 

CLAIM I claim an ornamental design for a smartphone battery, as shown and described. 